Edwards nEXT85 User Manual

Bearing and oil cartridge maintenance
The oil cartridge and oil-lubricated bearing must be replaced when it reaches the end of its
service life. This is typically aer 35,000 hours.
When the oil cartridge and/or bearing need replacing, Edwards recommends:
• Send the pump to an Edwards Service Centre for a bearing and/or oil cartridge
replacement.
• Purchase an oil cartridge or bearing service kit and replace the bearing and/or oil
cartridge on-site (refer to Service on page 74) .
Rotor life
The
fague life of nEXT85 Turbomolecular pump rotors is typically 40,000 to 50,000 cycles. As a
precauonary measure, Edwards recommends that pumps are returned for a major service
(rotor replacement) aer 20,000 cycles of acceleraon to full speed and back to a stop, or aer
ten years of use, whichever occurs rst.
Cleaning the pump
WARNING:
Clean the external surfaces of the pump in a well venlated locaon. When using cleaning
soluons and solvents to clean the pump, observe all precauons specied by the
manufacturer. Avoid inhalaon of any parculates which may be present in the pump.
CAUTION:
Do not aempt to clean any parts of the pump other than external surfaces. Organic
solvents may damage internal pump components. Do not use abrasive materials to clean
any part of the pump.
If the inside of the pump is contaminated, it may not be possible to achieve the specied
ulmate vacuum performance, or pump-down mes may increase.
In these circumstances the pump must be returned to an Edwards Service Centre where the
pump will be dismantled and cleaned. Use the procedures in Figure 21 on page 104 and Figure
22 on page 105 to return the pump.
Any organic solvent can be used to clean the external surfaces of the pump. Edwards
recommend the use of non-CFC solvents such as isopropanol or ethanol. Only a minimal
amount of a cleaning soluon is required which is suitable for the contaminants on the pump
surfaces.
For environmental reasons, keep wastage of cleaning soluons and solvents to a minimum.
Decoding service status words
The service status may be accessed directly via the serial link. This method of accessing service
status will give the most complete picture of current and future service requirements and will
allow
preventave maintenance acvies to be scheduled.
A summary of the current pending service status is provided in response to the service status
command:
B8G0-00-880A - Maintain the nEXT85
Page 59

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English